Buffing mechanism



Patented May 1, 1928.

UNITED STATES STACY B. HASELTINE, OF CHICAGO, ILLINOIS, ASSIGNOR TO H. MINER, INC., (OF.

PATENT orsi-cr..

CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.`

BUFFING MECHANISM.

Application filed May 6,

taining a mainspring means, and preliminary spring means, and a friction system interposedbetween'the main and preliminary spring meansA together with a buffer head adapted under the influence of relatively light shocks to compress the preliminary springs only, and under the inuence of heavier shocks to compress the preliminary springs, actuate the friction system, and compress'the main spring means.

Another object of the invention is to provide a shock absorbing'mechanism of the character described in which liners are provided which co-operate with the friction shoes of the friction system, and wherein the liners have extensions projecting outwardly beyond one end of the housing to provide substantial guide means for the buffer head of the mechanism, said guide means serving also as stops for limiting the forward movement of the buffer head, which in turn retains the operative parts of the mechanism in assembled condition.r

Another object of the invention is to provide a buliing mechanism wherein the liners for the friction system are detachably connected with the housing and maintained in operative position with respect thereto by the wedge and other members of the friction system under the influence of the spring means associated with the mechanism, said liners being so arranged that the forward ends thereof may be spread by the application of pressure to permit the detachable insertion of the buffer head, and linter-engagement'of means on the buffer head with stops on the liners, whereby the buffer head is limited in its forwardmovement and operates to maintain the operative parts of the mechanism in assembled relation with the housther and further objects of the invention will more clearly and fully appear from the description and claims hereinafter follow- In the drawings forming a part of this specification, Figure 1 is a fragmentary vertical longitudinal sectional view of the end platform of a railway car showing the invention in connection therewith. Figure 2 is a horizontal sectional view taken central- 1927. vsemen No. 189,202.

ly through the bufling mechanism forming the subject matter .of the invention. Figure 3 is a front elevational view of said butrlng mechanism. Figure 4 is a transverse verti- `cal sectional viewof the buliing mechanism,

l pocket for the reception of a bulfing mechanism, indicated broadly `by the reference character l2, the buifing mechanism being supported in the ypocket by a web 13. The bufling mechanism co-operates with a center stem indicated at lll-,the outer end of the stem being engageable by the end platform member l5, whichis supported in position by the usual side stems, not shown. Y

The invention includes broadly a housing A; a main spring meansB;r liners C; wedge and friction elements D; and a buiiing head E.

f The housing A is provided `with integral top and bottom walls 11G-16, side walls 17-17 and an end wall 18, the housing being open at its forward end. Adjacent the forward end of the housing at the inner sides of the side wall 17--17 are provided abutments, in the form of spaced ribs 19 and 20, the inner rib being cut out asf indicated at 21. Mounted in the housing is the main spring means B, which comprisesa pair of heavy coiled Springsarrangedside by-side and each of the same has associated therewith face of the follower` is provided with a bossl 23 adapted to coact with the friction shoes hereinafter referred to to maintain the follower in proper position.

` The liners C are two in number, one of the same being associated with each side wall 17-17 of the housing A. Each of the liners comprises the liner portion proper indicated at 2l, and the extension 25 which provides guide means for the buffer head E as hereinafter described. The liner portion Qi of each liner is provided with an abutment flange 2G extending transversely across the rear end thereof, said flange bcing adapted t inter-engage with the abutment Qt) on the housing il when the parts are in operative position. 'l` he inner surface of `each liner portion 2l is provided with a friction face 240, for co-operation with the wedge and friction shoes D as hereinafter described. At. the forward end of each liner portion 2l a rib abutment 2T is provided adapted to bear against the end of each side wall 17. The extension E on each liner is integrally formed with the liner portion 2ML, and consists of a wall of the same width as each side wall 1T of the housing B, the wall being olf-set inwardly somewhat with respect to cach side wall 17 when the parts are in operative position. The outer surface of the wall providing the e1;- tension 25 is provided with a reinforcing rib indicated, at 126. The inner surface of the extension 25 of each ot the liners is provided with a longitudinally extending centrally disposed groove 28, adapted to provide guide means for the buffer head E hereinafter described, the groove 28 terminating somewhat inwardly of the extremity of the extension :25 to provide a beveled stop shoulder 2S). A s above stated, both of the liners C are identically similar except for their opposite disposition, and similar reference characters are employed to indicate like parts of both.

Co-operating with the friction surface 2st() of each of the liner portions Qi, are the friction shoes D. Each of said friction shoes is provided with a friction face indicated at 30 adapted to co-act with the friction face 240 on the liner portion 2li. the opposite side of each shoe being provided with a wedge face 3l adapted for co-action with a similar wedge face on the wedge 32. Each friction shoe is cut out toward the rear end thereof as indicated at 33 and the rear ends of both shoes bear upon the forward face of the follower 22, and are disposed between thc shoulders provided by the boss 23 and the rear ends of the liner portions 2li. The wedge. 32 is provided with a reduced extension 3l, providing shoulders 3:3-35- Bearing upon said shoulders is one end of a coiled spring 36, and a coiled spring 37, the latter extending axially through the spriner 36, the outer ends of the springs 3G and 3f bearing upon the buffer head E, and being disposed about a central post 38 formed on the buffer head, the post 38 being adapted to engage the extension 34 on the wedge in certain positions of the parte.

The front face of the buffer head E has inset therein a. striking plate 39 adapted to be engaged by the center stein i4, said buffer head also including a rearwardly extending peripheral flange 4.0, the side port-ions of said flange being provided with beveled lugs Al-l--l1 slidably disposed in the guide grooves provided in the liners C, .said lugs being adapted to engage the stops Q9 on the liners7 limiting outward movement of the buller head lil and maintaining all parts of the mechanism in assembled relation, while the side portions of said [lange Ait) (fo-operate with the walls ol' the liner extensions at cach side of the grooves and provide substantial guide means for the bnlier head.

In operation, assuming a relatively light shock transmitted by the center stem il to the butter head E, said buffer head will move inwardly against the resistance oll'ered by the springs {it} and 3T, which bear upon the wedge and friction shoes, which are maintained in their normal positions by the main spring means B, removal of pressure from the butfer head pcrn'iittingv the same to resume its outermost position and held by the stops 29 on the liners C, the butter head of course being guided during this movement in the grooves 28. A relatively heavy shoelv' transmitted by the stem 14 to the bntl'er head E will cause inward movement against. the preliminary springs 3G and 3T as before described, and additional movement of the buffer head caused by the greater movement of the stem Ll will cause the post 38 to come into contact with the extension 34 on the wedge 32, moving said wedge toward the rear wall iti of the lions ing` setting up friction between the friction surfaces 30 and 2l() of the friction shoes and the liner portions Q4, and causing rearward movement of the friction shoes against the follower 22 which bears upon the main spring resistance B. Vvhen the device is fully compressed, the upper and lower edges of the buffer head come into contact with the top and bottom walls of the housing A and hence prevents twerloading olI the main springs. Upon removal of pressure from the buli'er head the various parts will be returned to initial position under the intluence of the springs B and 36 and 37.

In assembling the mechanism, the main springs B are first inserted. after which the follower 2:2 is placed in position. rI`he liners C are then inserted into the housingr and the abutments on the liners and housing interengaged, and the shoes and wedge are placed in position, as are the springs 36 and 37 and butler head E. The beveled lugs sil-ll of the butler head E are positioned to enter the guide grooves 28, after which the bnfier head is forced inwardly, ten'iporarily spreading the outer ends of the liners until the lugs Atl---ll of the buffer head l1) move into the guide grooves Q8. After the buffer head is in position the liners are held lot) headE and the extensions of the liners' C at opposite sides of the grooves 28 and lugs Lil-*fil piovide large guide and wear surfaces for the buffer head in its movement relative to the linersC,^while the guide lugs and grooves in addition to their guiding function maintain the device in assembledv relation.`

While I have herein shown and described WhatI consider rthe preferred manner of' carr ing out the invention,.the same is nierely il ustrative, and I contemplate all changes and modifications which come Within the scope of the claims appended hereto.

'I claim:

1. In a shock absorbing mechanism of they character described, the combination with a housing open at one end; of oppositely disposed liners for'said housing having abutment means detachably inter-engaged with abutment means on said housing, said liners being provided with extensions projecting beyond the open end of said housing; wedge and friction means adapted to coact with friction surfaces on said liners, and to exert pressure thereon in a lateral direction to maintain said inter-en-k gagement of the abutments on said liners and said housing; a buffer head having lugs inter-engaged with the outer ends of the extensions on said liners; and main yieldable means interposed between fixed portions of said housing and said Wedge and friction means, and preliminary yieldable means interposed between the latter and said buffery head.` i

2. In a shock absorbing mechanism of the character described, the combination with a housing; friction linersf for said housing,

said liners being provided with extensions projecting beyond one end of said housing to form guide means; a buffer head movably engaging the guide: means provided by the liner extensions; and friction means cooperating with said liners to resist movement of said bufferhead .inwardly of said housing.

3. In a shock absorbing mechanism of the character described, the combination with a housing; liners for said housing provided with friction surfaces, said liners having extensions projecting beyondsaid housing; a Wedge; friction shoes co-operating with said wedge and the friction surfaces on said liners; a main yieldable means interposed between a fixed portion of said housing and said friction shoes and bearing on theilatter; a buffer headfoperatively engageable with the extensions on said liners; and preliminary springs interposed between said buffer head and ysaid Wedge and bearing upon the latter and said buiferhead.

4. In a shock absorbing mechanism of the character described, the combination with a housing; liners for said housing .provided with friction surfaces,said liners having ex-` tensions projecting beyond said housing; a wedge; friction shoes copper-ating with said wedge and vthe v.friction surfaces on said liners; a main yieldable ineansinterposed between a fixed portion of said housing and said friction shoes and bearing on the latter; a buffer head operatively engage-able with the extensions on said liners; and preliininary springs interposed between said buffer head and said wedge and bearing upon the latter and said buiferhead,saidliners being provided lwith guide grooves, terminating short of the ends thereof to lprovide stops, and said buffer head having lugs disposed in said guide grooves.

In a shock absorbing mechanism of the character described, the combination with Va housing; liners for said housing lprovided with friction surfaces, said liners having extensions projecting beyond ysaid housing; a wedge; `friction shoes co-operating with said wedge and the friction surfaces on said liners; a main yieldable ynieans interposed between a iixedportion of said housingand said friction shoes and bearing onthe latter; a buffer head operatively mountedbetween the extensions on said liners; and preliminary springs interposed between said buffer' head and said wedge and bearing upon the latter and said buEer head, said liners having abutments detachably inter-engaging and being with abutments on .said housing, maintained in operative relation by lateral pressure exerted by the wedge upon saidy -tensions projecting beyond said housing; a

wedge; friction shoes cooperating with said wedge and the friction surfaces on said liners; a main yieldable means interposed between a fixed portion of said housing and said friction shoes and bearing on the latter; abuifer head operatively mounted between the extensions on said liners; and preliminary springs interposed between said buffer head and said wedge and bearing upon the lat-ter and said buffer head, said liners having abutments detachably inter-engaging with abutments on said housing, and being maintained in operative relation by lateral pressure exerted by the wedge upon said friction shoes, the outerv ends of said extensions being separable by the application of pressure thereto to eti'eet operative engagement, and detachment from operative position, of said butter -head with respect to the extensions of said liners.

7. ln a shock absorbing mechanism of the character described, the combination with a housing; ol' liners for said housing having friction surfaces thereon, said liners and said housing being provided with inter-engaging abutments; vieldable means co-acting with said liners and operating to yieldably maintain said abutments in inter-engaging position; extensions rigidly connected to said liners and projecting outwardly of said housing, said extensions being separable by application ot power to overcome the yieldable means normally nniintaining the liners in position: a butter head; and means on said butter head and the extensions of said liners adapted to be inter-engaged to slidably mount the butl'er head in said extensions.

8. In a shock absorbing mechanix-in'i of the character described, the combination with a housing; of liners t'or said housing having friction surfaces thereon, said liners and said housing heilig provided with inter-engaging abutments; yieldable means co-acting with said liners and operating to yieldably maintain said abutments in inter-engaging position; extensions rigidly connected to said liners and projecting outwardly oit said housinfr, said extensions being separable by application of power to overcome the yieldable means normally maintaining the liners in position; a butter head; means'on said butler head and the extensions ot said liners adapted to be inter-engaged to slidably mount the butler head in said extensions, the yieldable means for maintaining the abutments ol said liners and said housing in inter-engaging relation comprising friction elements bearing upon the t'rietion surfaces of said liners; and resilientJ means bearing upon said friction elements and said but'ler head.

t). As an article ot manufacture, a friction liner for use in connection with a butl'er, comprising a liner portion proper and an extension having means tor the reception of a movable member such as a butler head and providing a combined guide and stop therefor.

l0. In a shock absorbing mechanism of the character described, comprising a housing having integral top, bottom, side and end walls, the side walls ot' said housing being provided with abutments; liners having abutments inter-engaging with the abut,

ments provided by the side walls of Said housing, and each ol the same haring an xtcnsitiin thereon, projecting outwardly beyond the end oi said housing, and each cxtcnsion being provided with a guide groove, and a stop; ot a main spring means disposed in said housing and bearing against a tixed portion thereon; a follower t'or said main spring means; friction shoes co-operating with the vl'riction surfaces ot' said liners; a wedge; a butler head having lugs slidably mounted in the grooves in said extensions and adapted to ifo-operate with the stops thereon to limit outward movement ot' the butter head; and preliminary springs interposed betwcen said wedge and said buffer bead.

l'i. ln a shoclr absiirbing mechanism of the character described, comprising allonsing having integral top, bottom, side and end walls. the side walls of said housing being provided with allotments; liners having abuiments inter-ei'igaging with the abutments provided by the side Walls of said housing, and cach ol? the same having an extension thereon, projecting outwardly beyond the end of said housing, and each extension being provided with a guide-groove, and a stop; ot a main spring ,means disposed in said housing and bearing' against a fixed portion thereon; a follower' tor said main spring means; 'friet-ion shoes co-operating with the friction surfaces of said liners; a wedge; a butl'cr head having lugs slidably mounted in the grooves in said extensions and adapted to cooperate with the stops thereon to limit outward movement; ot' the butler head; and preliminary springs interposed between said wedge and said butl'er head, said butler headand said liners being detachable under pressure and n'iaintained in operative position by the pressure exerted upon the liners by said trictiou shoes, said wedge and said preliminary springs.

In Witness that l claim the foregoing I have hereunto subscribed my name this 3rd day of May, '1927.

STACY B. HASELTINE. 

